Most of the mass of the universe is in the form of
A) stars
B) gas clouds
C) black holes
D) dark matter
D
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For nearby galaxies, determining the rotation curve allows us to calculate the mass
Indicate whether the statement is true or false
At a given point above Earth's surface, the free-fall acceleration is equal to What is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A) 770 km B) 970 km C) 1500 km D) 2000 km E) 2400 km
The position of an object that is oscillating on a spring is given by the equation x = (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?
A) 17.4 rad/s B) 0.869 rad/s C) 0.183 rad/s D) 5.46 rad/s E) 2.34 rad/s
The half-life of radioactive Technetium-99 is 6.0 hours. Find the number of 99Tc nuclei necessary to produce a sample of activity 18 µCi. (1 Ci = 3.7 × 10^10 decays/second)
a. 1.2 × 10^9 c. 8.0 × 10^8 b. 3.4 × 10^11 d. 2.1 × 10^10